Trayvon Martin's mom, Sybrina Fulton, wrote a heartbreaking letter published in Time magazine to the family of Michael Brown, the unarmed 18-year-old recently shot and killed by a police officer in Ferguson, Mo.

Fulton says she wishes she could say "it will be alright" but the truth is she can only "pray" as their "lives are forever changed."

"Our children are our future so whenever any of our children – black, white, brown, yellow, or red – are taken from us unnecessarily, it causes a never-ending pain that is unlike anything I could have imagined experiencing," Fulton writes.

A member of the Federal Protective Service asks demonstrators to stay off the steps leading to the Thomas F. Eagleton federal courthouse during a protest in St. Louis. About 100 protesters marched from city hall to the courthouse as they continue to press for broader reforms to local and federal law enforcement following the shooting death of Michael Brown by police. (Photo: Jeff Roberson, AP)

Members of the Tauheed Youth Group pray with demonstrators and members of the 'Justice for Michael Brown Leadership Coalition' during a march near the Buzz Westfall Justice Center in Clayton, Mo. (Photo: Larry W. Smith, epa)

People pray after marching about a mile to the police station to protest the shooting of teenager Michael Brown in Ferguson, Mo. Brown's shooting on Aug. 9 by a Ferguson police officer has sparked more than week of protests, riots and looting in the St. Louis suburb. (Photo: Charlie Riedel, AP)

U.S. Attorney General Eric Holder shakes hands with Bri Ehsan, 25, following his meeting with students at St. Louis Community College-Florissant Valley in Ferguson, Mo. Holder was in Ferguson to oversea the federal government's investigation into the shooting death of 18-year-old Michael Brown by a police officer on Aug. 9th. (Photo: Pablo Martinez Monsivais, pool)

A citizen peacekeeper tries to keep protesters back as police advance on Aug. 18 in Ferguson, Mo. The Aug. 9 shooting of Michael Brown by a police officer has touched off demonstrations in the St. Louis suburb where police have used riot gear and tear gas against protesters. (Photo: Christian Gooden, St. Louis Post-Dispatch, via AP)

Attorney Benjamin Crump, left, holds a diagram produced during a second autopsy of shooting victim Michael Brown as forensic pathologist Michael Balden speaks at a news conference Aug. 18 in Ferguson, Mo. The independent autopsy shows Brown was shot at least six times on Aug. 9 by a Ferguson police officer. (Photo: Jeff Roberson, AP)

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Fulton explains the dichotomy of detractors and supporters family members will face since they've sadly joined "this exclusive yet growing group of parents and relatives who have lost loved ones to senseless gun violence."

For Fulton, the loss meant devoting her life to the missions of The Trayvon Martin Foundation. She lends her support to Brown's family and "to seek justice for your Michael and the countless other Michaels & Trayvons of our country."

Fulton offers hope in perhaps the most touching line of the letter. "But know this: neither of their lives shall be in vain. The galvanizations of our communities must be continued beyond the tragedies."

African Americans are killed by white police officers nearly twice a week in the United States, according to the most recent accounts of justifiable homicide reported to the FBI during a seven-year period ending in 2012.

On average, there were 96 incidents among at least 400 police killings each year that were reported to the FBI by local police, USA TODAY found. The reports show that 18% of blacks killed during those seven years were under age 21, compared to 8.7% of whites.